In Sorte Diaboli (Latin for “In league with the devil”) is the eighth studio album by Norwegian symphonic black metal band Dimmu Borgir, released in 2007. It is the band’s first concept album. A site on the Nuclear Blast website was created for In Sorte Diaboli, in which a new promotional photo can be seen and an audio sample can be heard. This would be the last album by Dimmu Borgir to feature ICS Vortex, Hellhammer and Mustis.